Script to create an OpenVPN service

prepare-openvpn-service.sh

#!/bin/sh

# Before run this script, a docker host in a public cloud should be available
# The host can be created by the following commands:
#
#   docker-machine create -d digitalocean dev
#   eval $(docker-machine env dev)
#
# Then you can run this command simply by :
#
#   ./prepare-openvpn-service.sh all <server_address> <username>
#

function create {
    if [ -z "$1" ]; then
        echo "Usage: $0 create <server_address>"
        exit 1
    fi

    VPN_SERVER=$1
    docker volume create --name openvpn
    docker run -v openvpn:/etc/openvpn --rm kylemanna/openvpn ovpn_genconfig -u udp://${VPN_SERVER}
    docker run -v openvpn:/etc/openvpn --rm -it kylemanna/openvpn ovpn_initpki nopass
}

function destroy {
    docker rm --volumes --force openvpn
}

function run {
    docker run -v openvpn:/etc/openvpn -d -p 1194:1194/udp --cap-add=NET_ADMIN --name openvpn kylemanna/openvpn
}

function generate_config {
    if [ -z "$1" ]; then
        echo "Usage: $0 generate <username>"
        exit 1
    fi

    USER_NAME=$1
    docker run -v openvpn:/etc/openvpn --rm -it kylemanna/openvpn easyrsa build-client-full ${USER_NAME} nopass
}

function export_config {
    if [ -z "$1" ]; then
        echo "Usage: $0 export <username>"
        exit 1
    fi

    USER_NAME=$1
    docker run -v openvpn:/etc/openvpn --rm kylemanna/openvpn ovpn_getclient ${USER_NAME} > ${USER_NAME}.ovpn
}

function usage {
    echo "Usage: $0 {create|generate|export|run|destroy}"
}

function run_all {
    if [ ! "$#" -eq "2" ]; then
        echo "Usage: $0 all <server_address> <username>"
        exit 1
    fi

    VPN_SERVER=$1
    USER_NAME=$2

    create ${VPN_SERVER}
    run
    generate_config ${USER_NAME}
    export_config ${USER_NAME}
}

function main {
    Command=$1
    shift
    case "${Command}" in
        create)     create $@ ;;
        destroy)    destroy ;;
        run)        run ;;
        generate)   generate_config $@ && export_config $@ ;;
        export)     export_config $@ ;;
        all)        run_all $@ ;;
        *)          usage ;;
    esac
}

main $@